Hardware mods¶
BOOT and RESET buttons¶
Some of the ESP32-SI4732 receivers do not have the BOOT and RESET buttons soldered in. You will need these buttons if you want to recover a receiver that was bricked because of a failed flashing process.
You can use a pair of precision tweezers like this to short the button contacts:
Or solder the missing buttons:
Speaker¶
Some of the units have a smaller speaker. You can install a bigger one (1511) that is used in the original project (aliexpress.com, aliexpress.ru):
Hi-Z match circuit¶
Headphone amplifier¶
https://t.me/talkradio/174172/184530
Note: a new hardware revision with the LM4809 headphone amplifier has been spotted, see https://forum.vcfm.ru/viewtopic.php?f=9&t=2395&start=60#p187797